From the reviews of the second edition:
“The book under review is an introduction to the theory of categories which, as the title suggests, is addressed to the (no-nonsense) working mathematician, thus presenting the ideas and concepts of Category Theory in a broad context of mainstream examples (primarily from algebra). … the book remains an authoritative source on the foundations of the theory and an accessible first introduction to categories. … It is very well-written, with plenty of interesting discussions and stimulating exercises.” (Ittay Weiss, MAA Reviews, July, 2014)
Categories for the Working Mathematician
"A very useful introduction to category theory."—INTERNATIONALE MATHEMATISCHE NACHRICHTEN
It is a Great Book and it is quite helpful to me. (although some notions are old) The book is brand new.Published 9 months ago by Zhenchao Ge
This book is kind to the reader yet it does not over-explain the theory. It is comprehensive and current. .Published 10 months ago by Rafael H Alpizar
Here are the design patterns of mathematics. Unlike the computer science design patterns, these compose!
If you're a mathematician, you've already read this book. Read more
Category Theory shouldn't be this tough.
I was trained as an electrical engineer, so, my math is reasonably good.
However, I can't get through this book. Read more
This book has everything you need, but it is written in an abstruse style in my opinion.Published on December 7, 2007 by D. Spivak
I entirely agree with the reviewer Lucas Wilman.
As a book by the creator of category theory, it has extensively incorporated relevant items. Read more